Aneutron at rest decays (breaks up to a proton and an electron. energy is released in the decay and appears as kinetic energy of the proton and electron. the mass of a proton is 1836 times the mass of an electron.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.